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PubMed1992

Uniformity of serotype and electropherotype in local human rotavirus isolates during each of three successive cold seasons.

Each of three consecutive cold seasons (November-March) in the town of Tiberias, Israel, was dominated by one particular rotavirus serotype causing acute diarrhoea in the community: the 1987/88 season by serotype-2; 1988/89 by serotype-1 and 1989/90 by serotype-4. Each season was also characterized by a particular pattern of rotaviral RNA when visualized using electrophoresis in gels. RNA profiles of identical rota serotypes and serotypic prevalence for any given cold season were unique for the town of Tiberias and different from other localities throughout Israel. The meaning of these findings in terms of herd immunity is discussed.

Acute Disease↗
PubMed1977

Immunoepidemiology of meningococcal disease in military recruits. I. A model for serogroup independency of epidemic potential as determined by serotyping.

One hundred twenty strains of Neisseria meningitidis were serotyped with use of cross-absorbed rabbit antisera in a bactericidal test. Fifty-eight epidemic strains of serogroup B, C, and Y that occurred simultaneously among military recruits at two basic training centers during a period of epidemic meningococcal disease were compared with 62 strains of serogroups A, B, C, and Y isolated worldwide. Antisera to the six original antigenic factors of the Gold serotyping schema were adequate for typing 94% of strains, including all of the epidemic strains. The array of serotyping factors in the epidemic strains differed from those in the nonepidemic strains. Epidemic strains were almost exclusively of two serotypes, with type CII predominant among strains of groups B and C. Concurrent strains of groups B and C were invariably of the same serotype. A model for the epidemic potential of meningococcal strains, which is based on their serotype and serogroup antigens, and a modification of the original Gold typing schema are presented.

Adult↗
PubMed1983

The serotype and biotype distribution of clinical isolates of Campylobacter jejuni and Campylobacter coli over a three-year period.

Two hundred eighty-five isolates of Campylobacter jejuni-Campylobacter coli from children with gastroenteritis at The Hospital for Sick Children (Toronto, Canada) over a three-year period were biotyped by the hippurate hydrolysis test and serotyped on the basis of thermostable, soluble antigens by the passive hemagglutination technique. Hippurate-negative strains (C. coli) were only 3.2% of the isolates. Ninety-seven percent of the isolates were serotypable with 55 antisera. About half of the strains belonged to one of four serotypes (2, 4, 3, or 1); about three-quarters belonged to one of 10 serotypes. Serotype 2 was consistently the commonest serotype in each of the three years of the study, accounting for 15%-20% of all isolates tested.

Campylobacter↗
PubMed1985

Outbreak of endocarditis caused by Pseudomonas aeruginosa serotype O11 among pentazocine and tripelennamine abusers in Chicago.

At Cook County Hospital (Chicago), before 1977, the incidence of endocarditis caused by Pseudomonas aeruginosa was one or two cases per year. The frequency of P. aeruginosa as an etiologic agent of endocarditis among drug abusers increased steadily from five (23%) of 22 patients in 1977 to 15 (68%) of 22 in 1980. P. aeruginosa serotype O11 accounted for 34 (76%) of 42 of the strains serotyped. The total increase in incidence of P. aeruginosa endocarditis that we observed can be attributed to disease caused by serotype O11. We serotyped 152 strains of P. aeruginosa obtained from hospital inpatients without endocarditis. Serotype O11 was the most frequently isolated type, accounting for 27% of the total. Incidence of serotype O11 in drug addicts with endocarditis is significantly higher than the incidence in patients with nonendocarditis infections (chi 2 = 32.89; P less than .001). There was a high degree of correlation between pentazocine and tripelennamine ("T's and Blues") abuse and endocarditis caused by P. aeruginosa (chi 2 = 36.71; P less than .001).

Chicago↗
PubMed1986

Serotypic variations among virulent pneumococci in deposition and degradation of covalently bound C3b: implications for phagocytosis and antibody production.

To assess serotypic variability in resistance to phagocytosis and in elicitation of antibody response among virulent pneumococci, we quantitated covalently bound C3b and analyzed the C3b degradation fragments for log-phase pneumococci of serotypes 3, 4, 6A, and 14 after opsonization for 20 and 90 min. In C3/C4-deficient agammaglobulinemic serum reconstituted with [3H]C3, covalent binding ranged from 2.9 X 10(4) to 1.5 X 10(5) C3b molecules per organism and increased at least two-fold in the presence of type-specific anticapsular antibody. We compared amide- and ester-linked forms of covalently bound C3b among unencapsulated and encapsulated isolates and differentiated cell wall from capsular binding. Analysis of proteolytic degradation of C3b, covalently bound at the capsular level, revealed C3b, iC3b, and C3d on the capsular surfaces of serotypes 3 and 4, whereas serotypes 6A and 14 displayed only iC3b. We conclude that pneumococcal serotypes, differing in their capsular polysaccharide, differ as well in the amount and site of covalently bound C3b and in its degradative processing to iC3b and C3d. We describe how these differences may explain the well-recognized patterns of serotypic variance in resistance to phagocytosis and in stimulation of antibody production.

Antibodies, Bacterial↗
PubMed1990

Prevalence and serotype specificity of rotavirus antibodies in different age groups of Ecuadorian infants.

The age-specific prevalence of antibody to rotavirus was studied in 1404 Ecuadorian children enrolled in a national nutrition and health survey. ELISA and neutralizing antibody analysis showed evidence for primary rotavirus infection in 6- to 12-month-old children, who showed also a more-than-threefold increase in significant diarrheal episodes in comparison with infants less than 6 months old. At this age, 56% of the sera with neutralizing antibody were monospecific. With increasing age a gradual decrease in prevalence of monospecific sera, to 10% in 5-year-old children, was observed. Monospecific sera were directed in decreasing frequency against serotypes 4 (56%), 3 (20%), 2 (14%), and 1 (10%). Serotype 4-specific antibody was acquired at an earlier age than were antibodies to the other serotypes, and 91% of sera with dual specificity neutralized serotype 4, whereas only 2% of sera that neutralized three serotypes failed to neutralize serotype 4.

Acute Disease↗
PubMed2004

Serotype distribution and antimicrobial resistance of Streptococcus pneumoniae in Austria.

OBJECTIVES: To determine the prevalence of antibiotic resistance and the distribution of serotypes among Streptococcus pneumoniae isolated in Austria. MATERIALS AND METHODS: A total of 2367 strains of S. pneumoniae were collected in an Austrian-wide surveillance system between 1996 and 2002. Isolates were tested for their susceptibility to penicillin and clarithromycin and were serotyped by the capsular swelling method. RESULTS: An overall rise in penicillin resistance was observed from 4.9% in 1996 to 10.0% in 2002 (including both intermediate-resistant and resistant strains). A rise in clarithromycin resistance was also recorded in this period. The overall distribution of serogroups/types remained relatively stable, with 23, 19, 6 and 14 being the most frequent ones. Whereas in 1996 penicillin resistance was predominantly associated with serotype 23F, in 1998 and 2002, resistance was most frequently found in isolates of serogroup 9 and serotype 14, respectively. Coverage rates for currently available vaccines ranged from 57.4% (7-valent) to 72.4% (23-valent) of all serotyped strains. CONCLUSIONS: This rise in pneumococcal resistance to penicillin and clarithromycin, and the change in distribution of serotypes in these resistant strains, indicates that ongoing surveillance programmes are warranted, in order to be able to formulate both effective vaccination strategies and optimal antibiotic therapies.

Anti-Bacterial Agents↗
PubMed1993

Highly specific V3 peptide enzyme immunoassay for serotyping HIV-1 specimens from Thailand.

OBJECTIVE: To develop and evaluate a simple V3 peptide-based enzyme immunoassay (EIA) for large-scale serotyping of HIV-1 specimens from Thailand. DESIGN: Serologic reactivities with synthetic peptides derived from the V3 loop of gp120 were used for typing HIV-1 specimens. METHODS: Synthetic peptides PND-A and PND-B, derived from the consensus amino-acid sequences of the V3 loop of gp120 from two major genomic variants of HIV-1 in Thailand (A and B), were evaluated in an EIA on 61 Thai HIV-1 sera for which genotypes had been determined by polymerase chain reaction. The peptide EIA was then applied to sera from 188 HIV-1-infected patients, selected in non-random, convenience samples of known risk groups from four geographic regions of Thailand. RESULTS: The sensitivities and specificities of PND-A and PND-B were 86% (30 out of 35) and 96% (25 out of 26) and 92% (24 out of 26) and 94% (33 out of 35), respectively, with 100% predictive values of a monoreactive positive test for both peptides. The assay classified 101 specimens as serotype A, 39 as serotype B, eight as serotype AB (dually reactive), and 40 as untypable (non-reactive). Excluding dual reactors and non-reactors, 92% (77 out of 84) of specimens from patients probably infected by sexual contact were serotype A; conversely, 76% (28 out of 37) of injecting drug users were serotype B. CONCLUSION: The serologic results corroborated previous findings, in a smaller subset of samples, of an apparent segregation of viral subtypes by mode of transmission, suggesting two separate HIV-1 epidemics in Thailand. This peptide EIA could be a valuable epidemiologic tool in determining the dynamics of the rapid spread of HIV-1 in Thailand.

Comorbidity↗
PubMed1993

Cohort study of rotavirus serotype patterns in symptomatic and asymptomatic infections in Mexican children.

A cohort of 200 Mexican children from a low income periurban community was monitored from birth to the age of 2 years to determine the serotype-specific incidence, morbidity and seasonal pattern of symptomatic and asymptomatic human rotavirus (HRV) infections. A total of 177 HRV infections occurred in 134 (67%) children; 50% of these infections were asymptomatic. The incidence of all HRV infections was 0.6 episode/child year and was inversely related to age (r = -0.93; P < 0.01). The incidence of HRV-associated diarrhea was 0.3 episode/child year, with the highest frequency and severity occurring in infants between 4 and 6 months of age. HRV infections were more frequent each autumn, with a changing sequential pattern of predominant serotypes. Overall serotype 3 (34%) was the most frequent, followed by serotypes 1 (16%), 2 (15%) and 4 (6%). The 4 serotypes were associated with a similar risk for diarrhea and severity of diarrhea. In 23 (26%) HRV diarrhea-associated infections, an additional enteropathogen was identified; these mixed infections were more frequent in older children (chi square, 4.45; P < 0.05) but were not more severe (chi square, 0.02; P > 0.05). Our data indicate that HRV infections were common early in life, seasonal, frequently asymptomatic and caused by a variety of serotypes, none of which was a risk factor for diarrhea or severity of diarrhea.

Cohort Studies↗
PubMed2002

Pneumococcal serotypes from acute otitis media in rural Kentucky.

OBJECTIVE: Acute otitis media (AOM) accounts for most infections caused by, but few data are available regarding the incidence of pneumococcal serotypes recovered from children with AOM in the United States. METHODS: Between January 1992 and March 1998, 777 middle ear pathogens from AOM were obtained from 701 patients by tympanocentesis (84.6%) or by culture of otorrhea (15.4%) from spontaneous perforation or draining tubes. The ambulatory patient population was mostly white and cared for by a sole private pediatric practice in rural Kentucky. RESULTS: Penicillin-nonsusceptible (penicillin MIC > or = 0.1 microg/ml) (PNSP) isolates accounted for 18% [6% resistant PNSP (rPNSP) and 12% intermediate resistant PNSP], and penicillin-susceptible strains accounted for 35% of the pathogens recovered from children with culture-proved AOM. Comparing the frequency of isolates between 1992 and 1993 with those between 1994 and 1998, overall rates of PNSP strains remained remarkably stable (32.2% 37.3%), but intermediate resistant PNSP strains doubled from 14% to 27% ( < 0.01), whereas rPNSP strains fell by one-third. Serotypes 19F (34%), 23F (30%), 6B (26%) and 14 (8%) accounted for nearly all rPNSP isolates. Two cross-reactive serotypes (6A and 19A) not included in the available pneumococcal conjugate vaccine comprised 8.4 and 15% of all serotypes and PNSP serotypes, respectively. Nearly all PNSP strains recovered in children < or =24 months are included in the vaccine serogroups. CONCLUSION: Depending on rates of efficacy and serotype cross-protection, the current pneumococcal conjugate vaccine could potentially protect against most PNSP strains in all ages, particularly in those < or =24 months.

Age Factors↗
PubMedDate not supplied

Serotypes of Ureaplasma urealyticum isolated from patients with nongonococcal urethritis and gonorrhea and from asymptomatic urethral carriers.

Ureaplasma urealyticum strains isolated from urethral specimens of 112 patients with nongonococcal urethritis, 17 with gonorrhea, and 33 asymptomatic carriers (controls) were tested by the growth-inhibition test with standard ureaplasma antisera (serotypes 1-8). Cases with more than one serotype (two to four types) were encountered in 36.6% of patients with nongonococcal urethritis, 29.4% of those with gonorrhea, and 21.2% of controls. The most frequently recovered serotypes were type 4 from patients with nongonococcal urethritis (57.1%) and type 2 from patients with gonorrhea and controls (35.2% and 36.3%, respectively). The difference in frequency of serotype 4 between patients with nongonococcal urethritis and controls was statistically significant (P less than .001). An additional serotyping with types 9 and 10 antisera of the nontypable strains from patients with nongonococcal urethritis and controls (17.8% and 21.2%, respectively) revealed three type-9 strains. The results show a need for utilization of serotyping of U. urealyticum in studies of the epidemiology and transmissibility of genital infections with U. urealyticum.

Adult↗
PubMed2003

Serotype distribution and antimicrobial resistance patterns in Streptococcus pneumoniae isolates from hospitalized pediatric patients with respiratory infections in Shanghai, China.

BACKGROUND: Surveillance for pneumococcal respiratory illness was conducted in children hospitalized at Affiliated Pediatric Hospital of Fudan University in Shanghai from August 2000 to August 2001. METHODS: Sputum cultures were obtained from pediatric patients admitted with pneumonia or respiratory distress by tracheal aspirate. Blood cultures were also performed on a subset of patients. All pneumococcal isolates were serotyped and tested for antibiotic susceptibility. In addition clinical information on the patients including prior antibiotic history was abstracted. Streptococcus pneumoniae tracheal isolations were attempted in a total of 1013 pediatric patients hospitalized during this period. Among these samples 112 specimens were S. pneumoniae-positive. These positive isolates underwent serotyping and antibiotic susceptibility testing. RESULTS: Five serotypes (19F, 23F, 6A, 14, 6B) of S. pneumonia accounted for 81% (91 of 112 cases). Other serotypes accounted only for 12% (13 of 112 cases), and 7% (8 of 112 cases) of isolates could not be typed by quelling test. Only one blood culture isolate was positive, probably reflecting the frequent use of antibiotic treatment before hospitalization. Fifty-one and 8.0% of isolates had intermediate and high level penicillin resistance, respectively. Fifty-eight percent were resistant to ampicillin, 6.6% to cefazolin, 25.0% to cefaclor, 6.6% to ceftriaxone, 85.7% to erythromycin, 66.7% to clindamycin and 28.2% to chloramphenicol. Among 66 isolates that were not susceptible to penicillin, serotype 19F was the most common, followed by 23F and 14. CONCLUSION: S. pneumoniae is a common cause of respiratory illness requiring hospitalization in young children in Shanghai, with antibiotic resistance increasingly common. Five serotypes account for most disease.

Anti-Bacterial Agents↗
PubMed1977

An assessment by competition hybridization of the sequence homology between the RNAs of the seven serotypes of FMDV.

A comparison has been made of the RNAs of the seven serotypes of foot-and-mouth disease virus (FMDV) by competition hybridization. Homology among the three European serotypes A, O, C and the Asia I serotype was 60 to 70%. Similar homologies were found among the three Southern African Territories serotypes (SAT I, SAT 2, SAT 3), but homology between the two groups was much lower (25 to 40%). Homology between the RNAs of subtypes within serotypes A and O was greater than 70%. Double competition experiments with the Eropean serotypes indicate sharing of nucleotide sequences.

Aphthovirus↗
PubMed2001

An attempt to identify the evolutionary origin of a novel serotype of Salmonella enterica isolated from harbour porpoises.

The isolation since 1991 of a new serotype of Salmonella enterica (antigenic formula 4,12:a:-) from harbour porpoises (Phocoena phocoena) at post-mortem examination raised the question of its evolutionary origin. Representative strains of S. enterica serotype 4,12:a:- and strains of eight other serotypes of serogroup 04 with phase-1 flagellar antigen H 'a' were examined by EcoRI ribotyping, IS200 fingerprinting and PCR-based profiling. Statistical analysis of results of multiple typing showed that strains of Salmonella serotype 4,12:a:- were genetically distant from those of antigenically similar salmonella serotypes, none of which seemed likely to be the progenitor of the 'porpoise' serotype.

Animals↗
PubMed1991

Serological and genomic characterization of L338, a novel equine group A rotavirus G serotype.

A group A rotavirus designated L338 was isolated from the faeces of a diarrhoeic foal and was compared to 11 standard G serotype strains of group A rotaviruses by cross-neutralization. It was clearly distinct from serotypes G1 to G11 and thus representative of a novel rotavirus G serotype tentatively designated G13. The nucleic acid sequence of the virion protein 7 (VP7) coding region was determined and the deduced amino acid sequence compared to published sequences. Within VP7 regions A and B, L338 was clearly distinct from serotypes G1 to G12 (excluding G7 which has not been sequenced), but region C was very similar to those of G3 and G8. This further questions the significance of region C in determining serotype specificity of at least three distinct rotavirus G serotypes.

Amino Acid Sequence↗
PubMed2001

Molecular identification of new picornaviruses and characterization of a proposed enterovirus 73 serotype.

Enteroviruses (EV) have traditionally been identified by using serotype-specific antisera in a virus-neutralization test. Three EV strains isolated in California, USA, in 1955, 1964 and 1978, and a 1995 Oman isolate, were found to be antigenically related to one another; however, the strains were not neutralized by standard EV typing antisera, suggesting that they may represent a new EV serotype. The isolates were characterized genetically by RT-PCR coupled with amplicon sequencing and comparison to a database of enterovirus nucleotide sequences. The strains were 75.3 to 87.2% identical to one another in complete VP1 nucleotide sequence, but no more than 68% identical in sequence to the prototype strain of any EV serotype. Their complete capsid sequences were closely related to one another, but only distantly related to those of any EV prototype strain. The California and Oman isolates were most closely related to members of EV cluster B, suggesting that they are unclassified members (i.e. a new serotype) of cluster B. The complete genome sequence was determined for one isolate, CA55-1988, and the predicted polyprotein sequence was 86.5 to 89.2% identical to those of other cluster B EV and 56.7 to 61.9% identical to the polyprotein sequences of EV belonging to other clusters. Isolation of this new EV serotype from samples obtained on two continents and over a period of 40 years suggests continued circulation over a wide geographical area. In keeping with standard picornavirus nomenclature, we propose that this new serotype be named 'enterovirus 73' (EV73).

Antigens, Viral↗
PubMed1988

Immunological properties of the primer-independent glucosyltransferase of Streptococcus mutans serotypes d and g.

Streptococcus mutans serotype g secretes at least three kinds of glucosyltransferase with different enzymological and immunological properties. One of them is a primer-independent enzyme and seems to be the source of primer for the others, both of which are primer-dependent enzymes. Recently, we purified the primer-independent enzyme, the third glucosyltransferase in this group from S. mutans strain AHT-k serotype g. In the present study, we examined the specificity of the antiserum against the primer-independent glucosyltransferase using extracellular culture-conditioned fluids of many strains of the various serotypes of S. mutans. The antiserum cross-reacted with the extracellular culture fluids from strains of serotypes d and a, in addition to serotype g, but not with those of other serotypes, indicating that the primer-independent glucosyltransferase is secreted by the S. sobrinus and S. cricetus, but not by S. mutans and S. rattus. The antiserum did not completely inhibit the activity of the enzyme, even at more than twofold antibody excess, determined by indirect precipitation with immobilized staphylococcal protein A.

Animals↗
PubMed1988

Serotype-specific monoclonal antibodies against the H12 flagellar antigen of Escherichia coli.

The flagellar filaments of morphotype E isolates of Escherichia coli characteristically possess an apparent helically arranged sheath structure, surrounding the central core of the filament. Re-examination of the type strains of H-serotypes belonging to morphotype E showed that all but serotype H34 possessed the expected morphology. Heterogeneity was observed in both the diameter of filaments from individual morphotype E strains and in the Mr of individual flagellins. There was no apparent correlation between these two features. Monoclonal antibodies (MAbs) of the IgM class were raised against serotype H12 flagella. In Western immunoblotting and agglutination tests, the MAbs recognized the H12 antigen of six isolates with different O:K antigen combinations. The MAbs were H-serotype-specific, with no significant reaction with the H-antigens of other morphotype E strains. The location of the serotype-specific H12 epitope(s) was studied by immunolabelling with colloidal gold markers. The epitope was surface-exposed and appeared to be helically arranged on the flagellar filament. The pattern of colloidal gold labelling was consistent with the possibility that the H12 serotype-specific epitope resides in the apparent sheath structure.

Antibodies, Bacterial↗